Who invented the motion detector?

Leon Theremin was the Russian inventor of the motion detector. In the 1920s, Theremin created a device containing a sensor that could identify when a body approached. Theremin used this motion dect...
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What is a motion detector?

A motion detector is a device that can detect movement within its field. The movement can trigger a door opening, like when grocery store doors open, or sound an alarm or signal lights to come on w...
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